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V, CHARACTERI TON OF CONTAMINANT " In general, the concentration of TPH In Thorpe Oil sail is relatively low ( less than 400 ppm by IR method and less than 200 ppm by GC/FID method using hexadecane as standard). Further characterization studies of the contamination Involves runing standards of in-paraffin mixture (C-10 to C-38, with even number of carbon), freon solutions of gasoline, kerosine, diesel, as well as # 2 fuel oll(see Figures 2-8). Comparison of GC/FID chromatogram of Thorpe Oil soil extract with various standards showed that the contaminant In soil lacks the characteristio peaks of the highly volatile compounds, such as toluene, ethylbenzene and xylenes, which are present in gasoline. The loss of these low boilers might be the result of volatiftzation during the sampling and/or biodegradation. The fact that some moderate boilers (those > C-18), although at low level, are found in the sample extract, in addition to the presence of C-10, C-12 and C-14, which are three of five major components of kerosine, suggested the possibility that the contaminant may involve petroleum hydrocarbon fractlon heavier than gasoline or kerosine. Vi. GENER L The results of this brief treatability study Indicated that Thorpe Oil soil Is Contaminated predominately with low level of petroleum hydrocarbon fraction resembling partially degraded gasoline and kerosine Further tests Involving resperometric and microbio- logical assessment Indicated that the optimizatllon of sail nutrients and microbiological conditions resulted In a significant enhencementment In the biological activity of the cart as shown by the 002 release, which in turn suggested that the soil does not have any pronounced toxic element. Based on these finding It can be concluded that blorememediation can be applied . successfully to treat the TPH in Thorpe Oil soil. The treatment will be based on the optimization of nutrients, biological and physicochemical conditans. The following Is our proposed protocal for the treatment of eo0 Yds of soil. 1). Nutrient requirement to be applied at the start of treatment; Ammonium Monophosphate 48 lbs. Ammonium Sulphate 220 Ibs Urea 138 lbs Yeast Extract 2.2 Ibs Potassium Chloride 22 Ibs 2). Aeration can be achieved by soil tilling twice a week, 3) Water requirement- Water content of the soil should be mornitored and maintained at 12-14% level. 4). After nutrients applicatlion, water adjustment, and sufficient soil tilling, the microbial Inocula will be applied to catalyze the Initial phase of degradation. 8) Production of 80 liters of inocula has been arranged and will be ready for shipping on Deo.17, 1991. The inocula should be applied on the same day of arrival . 6), A duration period of 6-8 weeks Is expected for full scale treatment i 4 3T ,1 8iD H031 I9 W3H0AXO WdTT b0 Z6, TT 03a